Size:Medium, 2.1" x 1.3"

Make each letter a special delivery! Put a personal touch on your mail, or share this useful gift with friends and family. Zazzle’s medium custom stamps fit especially well on greeting card or RSVP envelopes.

The ONLY complaint I have is that I had to order in 20-count increments. So since I sent out more than 20 but less than 40, I have a few "wasted."
But other than that, I LOVE how this adds a personalized touch. They were easily read, didn't look homemade, and very personalizable as far as colors, fonts, and positions of text goes.